in compare-betas.js [198:224]
function compareBuildIDs(build_id1, build_id2) {
let year1 = Number(build_id1.substring(0, 4));
let year2 = Number(build_id2.substring(0, 4));
if (year1 > year2) {
return 1;
} else if (year1 < year2) {
return -1;
}
let month1 = Number(build_id1.substring(4, 6));
let month2 = Number(build_id2.substring(4, 6));
if (month1 > month2) {
return 1;
} else if (month1 < month2) {
return -1;
}
let day1 = Number(build_id1.substring(6, 8));
let day2 = Number(build_id2.substring(6, 8));
if (day1 > day2) {
return 1;
} else if (day1 < day2) {
return -1;
}
return 0;
}